INFLUENCE OF MEASUREMENT EQUIPMENT ON THE UNCERTAINTY OF PERFORMANCE DATA FROM TEST LOOPS FOR CONCENTRATING SOLAR COLLECTORS
Lüpfert, Eckhard and Pitz-Paal, R. and Pottler, Klaus and Eck, Markus and Zarza, E. and Riffelmann, K.-J. (2010) INFLUENCE OF MEASUREMENT EQUIPMENT ON THE UNCERTAINTY OF PERFORMANCE DATA FROM TEST LOOPS FOR CONCENTRATING SOLAR COLLECTORS. Journal of Solar Energy Engineering, 132 (3). American Society of Mechanical Engineers. DOI: 10.1115/1.4001476. ISSN 0199-6231.
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Parabolic trough concentrating collectors play a major role in the energy efficiency and economics of concentrating solar power plants. Therefore, existing collector systems are constantly enhanced and new types developed. Thermal performance testing is one step generally required in the course of their testing and qualification. For outdoor tests of prototypes a heat transfer fluid loop (single collector or entire loop) needs to be equipped with measurement sensors for inlet, outlet and ambient temperature as well as irradiance, wind speed and mass or volumetric flow rate to evaluate the heat balance. Assessing the individual measurement uncertainties and their impact on the combined uncertainty of the desired measurement quantity one obtains the significance of the testing results. The method has been applied to a set of EuroTrough collector tests performed at Plataforma Solar de Almería (PSA). Test results include the uncertainty range of the resulting modeling function and exemplify the effects of sensors and their specifications on the parameters leading to an uncertainty of ±1.7%-points for the optical collector efficiency. Measurement uncertainties of direct normal irradiance and mass flow rate are identified as determining uncertainty contributions and indicate room for improvement. Extended multiple sensor deployment and improved calibration procedures are the key to further reducing measurement uncertainty and hence increasing testing significance.
|Title:||INFLUENCE OF MEASUREMENT EQUIPMENT ON THE UNCERTAINTY OF PERFORMANCE DATA FROM TEST LOOPS FOR CONCENTRATING SOLAR COLLECTORS|
|Journal or Publication Title:||Journal of Solar Energy Engineering|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Publisher:||American Society of Mechanical Engineers|
|Keywords:||parabolic trough, extended prototype testing, efficiency, thermal measurement, measurement uncertainty, combined uncertainty, qualification|
|HGF - Research field:||Energy|
|HGF - Program:||Renewable Energies|
|HGF - Program Themes:||E SF - Solar research|
|DLR - Research area:||Energy|
|DLR - Program:||E SF - Solar research|
|DLR - Research theme (Project):||E - Qualifizierung|
|Institutes and Institutions:||Institute of Technical Thermodynamics > Solar Research|
|Deposited By:||Nicole Janotte|
|Deposited On:||21 Jan 2011 15:27|
|Last Modified:||04 Apr 2013 16:27|
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